The Burj Khalifa is a skyscraper in Dubai, United Arab Emirates, and is the tallest man-made structure on Earth at 828 m (2,717 ft). Construction began on September 21, 2004, with the exterior of the structure completed on October 1, 2009 and the building officially opened on January 4, 2010. The total budget for the contrsctuion of the tower is estimated at about $1.5 billion. The price of office space at Burj Khalifa had reached $4,000 per sq ft (over US$43,000 per m2) and that the Armani Residences, also in Burj Khalifa, were selling for US$3,500 per sq ft (over US$37,500 per m2)